Intake Valve: head_diameter 30-50 mm, stem_diameter 5.5-8.0 mm

Component Specifications

Definition

The intake valve is a critical component of the cylinder head assembly in internal combustion engines, responsible for precisely timing and regulating the entry of air-fuel mixture into the combustion chamber. It operates through a camshaft-driven mechanism, opening during the intake stroke to allow mixture entry and closing during compression, combustion, and exhaust strokes to maintain cylinder pressure. Modern intake valves feature sophisticated designs including variable valve timing systems, multi-valve configurations, and advanced sealing technologies to optimize engine efficiency, power output, and emissions control.

Working Principle

The intake valve operates on a camshaft-driven mechanical principle where the cam lobe lifts the valve off its seat against spring pressure, creating an opening for air-fuel mixture entry. During the intake stroke, piston downward movement creates negative pressure, drawing mixture through the open valve. The valve closes via spring force when the cam lobe rotates away, sealing the combustion chamber for subsequent strokes. Advanced systems incorporate hydraulic lifters, variable valve timing actuators, and electronic control to optimize valve timing and lift based on engine operating conditions.

Materials

High-temperature alloy steel (typically 21-4N, 23-8N, or Inconel alloys), heat-treated to Rockwell C 30-40 hardness, with chromium-plated stems (0.002-0.003" thickness) for wear resistance. Valve faces often feature Stellite or similar hard-facing alloys (HRC 45-55) for seat durability. Material composition typically includes: Cr 20-22%, Ni 3.5-4.5%, Mn 8-10%, Si 0.3-0.6%, C 0.48-0.53%, N 0.35-0.45%.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Seat Width	1.0-2.5 mm
Valve Angle	45 degrees (standard), 30 degrees (performance)
Head Diameter	30-50 mm
Stem Diameter	5.5-8.0 mm
Stem Tolerance	±0.01 mm
Surface Finish	Ra 0.4-0.8 μm
Spring Pressure	50-80 lbs @ installed height
Operating Temperature	Up to 800°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO/TS 16949, DIN 1880, SAE J775

Parent Products

This component is used in the following industrial products

Cylinder Head

The top cover of an engine cylinder that seals the combustion chamber and houses valves, spark plugs, and fuel injectors.

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Engineering Analysis

Risks & Mitigation

Valve sticking due to carbon deposits
Valve seat erosion from poor sealing
Valve spring fatigue leading to float
Thermal cracking from overheating
Stem galling due to inadequate lubrication

FMEA Triads

Trigger: Carbon buildup on valve stem
Failure: Valve sticking open or delayed closing
Mitigation: Regular cleaning with specialized solvents, improved fuel quality, installation of oil catch cans in PCV systems

Trigger: Excessive valve seat wear
Failure: Compression loss and reduced engine efficiency
Mitigation: Proper valve lash adjustment, use of hardened valve seats, regular valve clearance checks

Trigger: Valve spring fatigue
Failure: Valve float at high RPM causing piston contact
Mitigation: Regular spring pressure testing, replacement at recommended intervals, use of dual or beehive spring designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Stem diameter: ±0.01 mm, Seat concentricity: 0.03 mm TIR max, Face runout: 0.05 mm max, Overall length: ±0.1 mm

Test Method

Dimensional inspection per ISO 1101, hardness testing per ASTM E18, leak testing at 0.5 bar pressure, metallurgical analysis per ASTM E3, surface finish measurement per ISO 4287

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Intake Valve

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Shandong Huaquan Power Co., Ltd.

Weifang, Shandong, CN

42,000 m²

ISO CE

Also makes: Water Pump, Diesel Engine, High-Pressure Pump and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “YC intake valve and exhaust val”
View source page ↗ huaquanpower.com · checked 2026-08-26

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What causes intake valve failure?

Common causes include carbon buildup leading to sticking, valve seat wear from improper seating, stem wear due to inadequate lubrication, thermal fatigue from overheating, and spring failure causing valve float at high RPM.

How often should intake valves be inspected?

Recommended inspection intervals are every 50,000-100,000 km for passenger vehicles or 2,000-5,000 operating hours for industrial engines, with more frequent checks in high-performance or severe service applications.

Can intake valves be reconditioned?

Yes, valves can be reconditioned through processes like stem polishing, tip grinding, and seat refacing if wear is within tolerance limits (typically less than 0.15 mm stem wear and minimal seat erosion).

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Intake Valve